LTE PUSCH Control Feedback Bit Allocation via Virtual Data
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Solution Overview
Problem
In LTE networks, the eNB struggles to accurately decode control information when it is transmitted alone via the PUSCH without data, due to the reliance on equations that depend on undefined or zero transport block sizes, leading to undetermined bit allocations and incorrect decoding.
Innovation Solution
The system employs virtual data to calculate bit allocations for control information, with modulation symbols set to zero power, allowing the eNB to distinguish between data and control information presence, and uses alternative equations to ensure correct decoding of control information even when no data is transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control information is transmitted alone via PUSCH without data, then uplink control feedback capability is improved, but decoding accuracy deteriorates due to undefined transport block sizes
Solution Approach 1:
The patent introduces an intermediary mechanism by using the PUSCH channel to carry control information when data is absent. The eNB uses alternative equations that do not depend on transport block size to determine bit allocation, effectively mediating between the need for control feedback and the decoding challenge caused by missing data
Solution Approach 2:
The patent changes the parameter dependency for bit allocation calculations. Instead of using equations that require transport block size (which is undefined when no data is transmitted), alternative equations are employed that calculate bit allocation based on other parameters such as resource block allocation and modulation order, thereby resolving the decoding accuracy issue
2Reliability
If alternative equations are used to calculate bit allocation without transport block size, then decoding reliability is improved, but system complexity increases
Solution Approach 1:
The patent segments the bit allocation calculation process into different pathways: when data is present, traditional equations are used; when data is absent, alternative equations are employed. This segmentation allows the system to maintain reliability by selecting the appropriate calculation method while managing complexity through conditional logic rather than always using complex alternative equations
3Measurement precision
If virtual data with zero power modulation symbols is used, then data presence detection accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The patent uses a form of signal 'color change' by setting modulation symbols of virtual data to zero power. This creates a distinguishable signal state that allows the eNB to detect whether real data is present or absent by examining the power level of received symbols, improving detection accuracy while adding minimal processing complexity
Data Source
AI summary
A network component comprising a plurality of encoders, a plurality of rate-matching modules coupled to the encoders, and a channel interleaver coupled to the rate-matching modules, wherein the rate-matching modules calculate the number of bits for rate matching a plurality of feedback control information based on a total number of bits allocated to a channel traffic without a traffic data. Included is a network component comprising at least one processor configured to encode a plurality of feedback control information, calculate the number of bits for rate-matching the feedback control information based on a total number of bits allocated to a channel traffic without a traffic data. Included is a method comprising receiving a downlink traffic, detecting a request to transmit uplink data in the downlink traffic, and transmitting feedback control information with or without data based on the request.